"A plants vascular system is made up of specialized cells that for straw-like tubes" is the one among the following that <span>allows
a plant's vascular system to work as a transport system. The correct
option among all the options that are given in the question is the third
option or option "C". I hope this helps.</span>
        
             
        
        
        
Answer:
The mitochondria, also called the powerhouse of a cell, is present in large numbers in almost every cell in the body.
Explanation:
 
        
                    
             
        
        
        
The medication would be the controlled variable, the factor that remains constant.
        
             
        
        
        
If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries. 
In case of birds, air sacs play an important role in respiratory system.